My First Web Application is not Working

I have tried to design a webapplication. the index file just presents two input fields and a submitt button, but when i press submitt, the browser displays '.../FirstServlet' not found. I think there is something wrong with allocation of files in the proper directories. or something else....? I have tried to deploy WAR File generated by NetBeans through Apache-Tomcat but same is the result?
The Error Header is as under:
HTTP Status 404 /MyApp/%E2%80%9Chttp:/localhost:808/FirstServlet"
The code is as under:
*1) Index.html:*
{color:#ff0000}+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">+{color}
{color:#ff0000}+<html>+{color}
{color:#ff0000}+<body>+{color}
{color:#ff0000}+<form method="POST" ACTION = "http://localhost:8080/FirstServlet" NAME="myForm">+{color}
{color:#ff0000}+<h2> Enter your name</h2>+{color}
{color:#ff0000}+<INPUT TYPE="text" name="name"/>+{color}
{color:#ff0000}+
+{color}
{color:#ff0000}+<h2> Salary</h2>+{color}
{color:#ff0000}+<INPUT TYPE="text" name="salary"/>+{color}
{color:#ff0000}+
+{color}
{color:#ff0000}+<INPUT type="submit" value="Submit"/>+{color}
{color:#ff0000}+</form>+{color}
{color:#ff0000}+</body>+{color}
{color:#
*+{color:#000000}FormServlet.java is as under:+*
*+{color}+{color}{color:#ff0000}+{color:#000000}
{color:#ff0000}import java.io.*;{color}
{color:#ff0000}import java.net.*;{color}
{color:#ff0000}import javax.servlet.*;{color}
{color:#ff0000}import javax.servlet.http.*;{color}
{color:#ff0000}public class FirstServlet extends HttpServlet {{color}
{color:#ff0000}// this method is being called by both doGet() and doPost(){color}
{color:#ff0000}protected void processRequest(HttpServletRequest request, HttpServletResponse response){color}
{color:#ff0000}throws ServletException, IOException {{color}
{color:#ff0000}// getting value of salary text filed of the HTML form{color}
{color:#ff0000}String salary = request.getParameter("salary");{color}
{color:#ff0000}// converting it to the integer.{color}
{color:#ff0000}int sal = Integer.parseInt(salary);{color}
{color:#ff0000}// calculating 15% tax{color}
{color:#ff0000}int tax = (int)(sal * 0.15);{color}
{color:#ff0000}// converting tax into string{color}
{color:#ff0000}String taxValue = tax + "";{color}
{color:#ff0000}// request object can store values in key-value form, later it{color}
{color:#ff0000}// can be retrieved by using getAttribute() method{color}
{color:#ff0000}request.setAttribute("tax", taxValue);{color}
{color:#ff0000}// getting object of servletContext{color}
{color:#ff0000}ServletContext sContext = getServletContext();{color}
{color:#ff0000}// getting object of request dispatcher{color}
{color:#ff0000}RequestDispatcher rd ={color}
{color:#ff0000}sContext.getRequestDispatcher("/secondservlet");{color}
{color:#ff0000}// calling forward method of request dispatcher{color}
{color:#ff0000}rd.forward(request, response);{color}
{color:#ff0000}}{color}
{color:#ff0000}// This method is calling processRequest(){color}
{color:#ff0000}protected void doGet(HttpServletRequest request,{color}
{color:#ff0000}HttpServletResponse response){color}
{color:#ff0000}throws ServletException, IOException {{color}
{color:#ff0000}processRequest(request, response);{color}
{color:#ff0000}}{color}
{color:#ff0000}// This method is calling processRequest(){color}
{color:#ff0000}protected void doPost(HttpServletRequest request,{color}
{color:#ff0000}HttpServletResponse response){color}
{color:#ff0000}throws ServletException, IOException {{color}
{color:#ff0000}processRequest(request, response);{color}
{color:#ff0000}}{color}
{color:#ff0000}}{color}
+*
*+{color:#000000}This servlet is intended to call the Second Servlet:{color}
{color:#ff0000}import java.io.*;{color}
{color:#ff0000}import java.net.*;{color}
{color:#ff0000}import javax.servlet.*;{color}
{color:#ff0000}import javax.servlet.http.*;{color}
{color:#ff0000}public class SecondServlet extends HttpServlet {{color}
{color:#ff0000}// this method is being called by both doGet() and doPost(){color}
{color:#ff0000}protected void processRequest(HttpServletRequest request,{color}
{color:#ff0000}HttpServletResponse response){color}
{color:#ff0000}throws ServletException, IOException {{color}
{color:#ff0000}response.setContentType("text/html");{color}
{color:#ff0000}PrintWriter out = response.getWriter();{color}
{color:#ff0000}// obtaining values of name and salary text fields of index.html{color}
{color:#ff0000}String name = request.getParameter("name");{color}
{color:#ff0000}String salary = request.getParameter("salary");{color}
{color:#ff0000}/* getting attribute value that has been set by the calling{color}
{color:#ff0000}servlet i.e. FirstServlet */{color}
{color:#ff0000}String tax = (String)request.getAttribute("tax");{color}
{color:#ff0000}// generating HTML tags using PrintWriter{color}
{color:#ff0000}out.println("<html>");{color}
{color:#ff0000}out.println("<head>");{color}
{color:#ff0000}out.println("<title>SecondServlet</title>");{color}
{color:#ff0000}out.println("</head>");{color}
{color:#ff0000}out.println("<body>");{color}
{color:#ff0000}out.println("<h1> Welcome " + name+ "</h1>");{color}
{color:#ff0000}out.println("<h3> Salary " + salary+ "</h3>");{color}
{color:#ff0000}out.println("<h3> Tax " + tax+ "</h3>");{color}
{color:#ff0000}out.println("</body>");{color}
{color:#ff0000}out.println("</html>");{color}
{color:#ff0000}out.close();{color}
{color:#ff0000}}{color}
{color:#ff0000}// This method is calling processRequest(){color}
{color:#ff0000}protected void doGet(HttpServletRequest request,{color}
{color:#ff0000}HttpServletResponse response){color}
{color:#ff0000}throws ServletException, IOException {{color}
{color:#ff0000}processRequest(request, response);{color}
{color:#ff0000}}{color}
{color:#ff0000}// This method is calling processRequest(){color}
{color:#ff0000}protected void doPost(HttpServletRequest request,{color}
{color:#ff0000}HttpServletResponse response){color}
{color:#ff0000}throws ServletException, IOException {{color}
{color:#ff0000}processRequest(request, response);{color}
{color:#ff0000}}{color}
{color:#ff0000}}{color}
+*
*+
{color}+{color}*

Syed_Asad wrote:
here is the XML :
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<servlet>
<servlet-name>FirstServlet</servlet-name>
<servlet-class>FirstServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>FirstServlet</servlet-name>
<url-pattern>/FirstServlet</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<servlet>
<servlet-name>FirstServlet</servlet-name>
<servlet-class>FirstServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>FirstServlet</servlet-name>
<url-pattern>/FirstServlet</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>I'm assuming you accidentally posted your xml file twice. That is, the file should end at the first instance of </web-app>.
But what I also notice is that you don't appear to be using packages. You need to indicate the fully qualified class name of the servlet as the value of the <servlet-class> element inside the <servlet> tag. And fully qualified class names include packages. It's important when developing web applications to place your class files in packages. It's important generally, but specifically with web app development.
Edited by: nantucket on Jul 12, 2008 9:16 PM

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       ASP.global_asax..ctor() +0
    </pre></code>
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       at ASP.global_asax..ctor()
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        <Level>2</Level>
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        <Keywords>0x80000000000000</Keywords>
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                &lt;b&gt; Description: &lt;/b&gt;The application attempted to perform an operation not allowed by the security policy.  To grant this application the required permission
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                          &lt;code&gt;
    An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.&lt;/code&gt;
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                &lt;b&gt;Stack Trace:&lt;/b&gt; &lt;br&gt;&lt;br&gt;
                &lt;table width=100% bgcolor="#ffffcc"&gt;
                   &lt;tr&gt;
                      &lt;td&gt;
                          &lt;code&gt;&lt;pre&gt;
    [SecurityException: That assembly does not allow partially trusted callers.]
       ASP.global_asax..ctor() +0
    &lt;/pre&gt;&lt;/code&gt;
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                &lt;br&gt;
                &lt;hr width=100% size=1 color=silver&gt;
                &lt;b&gt;Version Information:&lt;/b&gt; Microsoft .NET Framework Version:2.0.50727.4214; ASP.NET Version:2.0.50727.4209
                &lt;/font&gt;
        &lt;/body&gt;
    &lt;/html&gt;
    &lt;!--
    [SecurityException]: That assembly does not allow partially trusted callers.
       at ASP.global_asax..ctor()
    [TargetInvocationException]: Exception has been thrown by the target of an invocation.
       at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean&amp; canBeCached, RuntimeMethodHandle&amp; ctor, Boolean&amp; bNeedSecurityCheck)
       at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean fillCache)
       at System.RuntimeType.CreateInstanceImpl(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean fillCache)
       at System.Activator.CreateInstance(Type type, Boolean nonPublic)
       at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
       at System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context)
       at System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext)
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       at System.Web.HttpRuntime.FirstRequestInit(HttpContext context)
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    --&gt;
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    Event ID:      13051
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        <Level>3</Level>
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        <Data>No client computers have ever contacted the server.</Data>
      </EventData>
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    ============== MSG 3 ==============
    Log Name:      Application
    Source:        Windows Server Update Services
    Date:          9/21/2011 1:53:01 PM
    Event ID:      12002
    Task Category: 9
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    Keywords:      Classic
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